JPH09506U - Bicycle frame shock absorber - Google Patents

Abstract

(57) [Abstract] [Purpose] To increase the rigidity of a bicycle frame shock absorber and to easily change the spring constant of an elastic body for shock absorption. [Structure] The front end of a chain stay 8 is rotatably connected near the hanger portion 6 of the main frame 1, and one swing arm 13 is provided above the chain stay 8, and the swing arm 13 is provided.
The front end of the swing arm 13 is rotatably connected to the main frame 1 via a support shaft 14 extending in a direction orthogonal to the bicycle frame surface, and the rear end of the swing arm 13 is parallel to the support shaft. It is rotatably connected to the upper end of the back hawk 10 via another support shaft 15, and the lower end of the back hawk 10 is rotatably connected to the claws at the rear end of the chain stay 8 so that the rear wheel 11 has both sides. , Two quadruple link mechanisms that are integrally coupled to each other by the swing arm 13 and an elastic body 17 is inserted between the main frame 1 and the swing arm 13 to form a long hole in the swing arm 13. By providing a plurality of holes, the fixing position of the elastic body 17 can be adjusted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shock absorber for a bicycle frame.

[0002]

[Prior art]

 Conventionally, as a shock absorber for a bicycle frame of this type, a structure having a structure as disclosed in Japanese Utility Model Publication No. 53-101650 and Japanese Utility Model Publication No. 54-156352, that is, a chain stay is used. And the back hawk are integrated into a rear frame, the front end of the chain stay is rotatably connected near the hanger part of the main frame, and an elastic body is arranged between the upper end of the back hawk and the main frame. Structural frame shock absorbers are known.

[0003]

[Problems to be solved by the device]

 However, in the conventional frame shock absorber as described above, since the main frame and the rear frame are connected only by one shaft near the hanger portion, the lateral rigidity of the frame is small, and the frame may be bent or twisted. In addition to the loss of pedal effort, the posture of the front and rear wheels collapsed and rolling resistance increased, and it became difficult to operate the steering wheel, and it was difficult to maintain balance.

In addition, since the conventional one uses a spring having a single spring constant, a large spring constant is set in consideration of a bad road at the time of design so as to cope with a large load. Therefore, it is not possible to obtain a sufficient cushioning effect against slight vibrations. In other words, there is also a problem that a sufficient cushioning effect cannot be expected during general driving.

In addition, since the conventional spring cannot adjust the spring constant, there is a problem in that it is very difficult to obtain a shock absorber that adapts to changes in the rider's weight and posture and the road surface on which the rider travels.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, the front end of the chain stay is rotatably connected to the main frame of the bicycle frame in the vicinity of the hanger portion, and one swing arm is provided above the chain stay. , The front end of the swing arm is rotatably connected to the main frame via a support shaft extending in a direction orthogonal to the frame surface of the bicycle, and the rear end of the swing arm is connected to the support shaft. Is rotatably connected to the upper end of the back hawk via another supporting shaft that is parallel to, and the lower end of this back hawk is rotatably connected to the claw at the rear end of the chain stay, so that it is attached to both sides of the rear wheel. , A two-joint link mechanism that is integrally connected to each other by the swing arm is formed, and an elastic body is interposed between the main frame and the swing arm to loosen the bicycle frame. Configure impulse device .

In the present invention, the rocking arm may be provided with a long hole or a plurality of holes so that the fixing position of the elastic body can be adjusted to form a shock absorber for a bicycle frame. Good.

Further, in the present invention, the ring-shaped elastic body is disposed between the swing arm and the main frame with the axis of the center hole thereof being orthogonal to the frame surface of the vehicle. It is also possible to construct a shock absorber for a bicycle frame.

[0009]

[Action]

 According to the present invention, as described above, the rear frame composed of the chain stay, the back hawk, and the single swing arm is connected to the main frame at two points, that is, the front end of the chain stay and the front end of the swing arm, so as to form a four-bar joint. In addition to configuring the link mechanism, the four-bar link mechanism is configured on both sides of the rear wheel, and they are integrally connected to each other by a single swing arm, so that lateral rigidity is not impaired and unevenness of the road surface is not impaired. Can absorb the shock caused by. Therefore, in the conventional device, it is possible to solve the problems of loss of pedaling force, increase of rolling resistance due to collapse of postures of front and rear wheels, and deterioration of steering wheel operability, which are caused by bending and twisting of the frame. The weight of the vehicle body is not excessively increased.

If the swing arm is provided with a long hole or a plurality of holes to adjust the fixing position of the elastic body, the apparent spring constant of the elastic body can be adjusted. It is possible to provide a frame shock absorber suitable for the weight and posture of the rider and the condition of the road surface on which the vehicle is traveling.

Furthermore, when a ring-shaped elastic body made of, for example, hard urethane rubber is used as the elastic body, the elastic body absorbs a shock under a light load, that is, a slight vibration in a state where the elastic body is not largely deformed. On the contrary, when a large load is applied, the elastic body is largely deformed and the hollow part is pressed, so that the rubber parts overlap each other, and as a result, the spring constant rises and the shock can be sufficiently absorbed. That is, by adopting this structure, it is possible to handle a wide range of loads from large loads to small loads.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the figure, 1 is a main frame which is the front half of the bicycle frame, 2 is its head pipe, 3 is an upper pipe, 4 is a lower pipe, 5 is a vertical pipe, and 6 is a hanger.

Reference numeral 7 is a rear frame which is a rear half of the bicycle frame, 8 is a chain stay thereof, 9 is a claw, 10 is a back hawk, and 11 is a rear wheel pivotally supported by the claw 9.

In the embodiment shown in FIGS. 1 to 5, the front end of the chain stay 8 is provided near the hanger portion 6 connected to the lower portion of the standing pipe 5 of the main frame 1 in a direction orthogonal to the frame surface of the bicycle ( 1, 2 and 5 are rotatably connected by a horizontal shaft 12 which is a shaft extending in a direction orthogonal to the plane of the drawing, and one is provided above the chain stay 8 in a state substantially parallel to the chain stay 8. Oscillating arm 13 is arranged, and the front end of the oscillating arm 13 is rotatably attached to the middle portion of the vertical pipe 5 of the main frame 1 by a horizontal shaft 14 as a support shaft parallel to the horizontal shaft 12. In addition to the connection, the rear end of the swing arm 13 is rotatably connected to the upper end of the backhawk 10 through a horizontal shaft 15 which is also parallel to the horizontal shaft 14 and also serves as a support shaft. After the chain stee 8 A rotatably connected to the claw 10 of the rear wheel 10 by a horizontal shaft 16 to form a four-bar linkage mechanism on each of the left and right sides of the rear wheel 11, and these four-bar linkage mechanisms are mutually connected by the one rocking arm 13. The bicycle frame is integrally joined and further has a cylindrical elastic body 17 having a bulged central portion interposed between the upper end of the vertical pipe 5 of the main frame 1 and the rear portion of the swing arm 13. A shock absorber.

Reference numeral 18 denotes a connector fixed to the upper end of the standing pipe 5, and the upper end of the elastic body 17 is connected to the connector 18 by a shaft 19. Reference numeral 20 denotes a connecting tool fixed to the swing arm 13 with a bolt 21 and a nut 22, and the lower end of the elastic body 17 is connected to the connecting tool 20 via a shaft 23.

3 and 4 are plan views of the swing arm 13, where 24 is an elongated hole provided on the upper plate of the swing arm 13 and 25 is a plurality of holes arranged in parallel. The fixing position of the lower end of the elastic body 17 can be arbitrarily adjusted by inserting the bolt 21 into any position of the elongated holes 24 or the holes 25 arranged in parallel and fixing the bolt 21 with the nut 22.

6 and 7 show another embodiment of the present invention. In this embodiment, a ring-shaped elastic body 26 is provided, and an axis of a center hole 26a thereof is orthogonal to a frame surface of a bicycle. Thus, it is arranged between the swing arm 13 and the standing pipe 5 of the main frame 1. Reference numerals 27 and 28 denote attachment bands for attaching the ring-shaped elastic body 26 to the vertical pipe 5 and the swing arm 13, and 29 is a fixing bolt thereof.

A spring, a rubber ball, a hard rubber or the like can be considered as the elastic body 17 in the embodiment shown in FIGS. 1 to 5, but the ring-shaped elastic body in the embodiment shown in FIGS. 6 and 7 is used. It is effective to use urethane rubber or the like as a material for 26.

Next, the operation of the frame buffer device configured as described above will be described. As shown in FIG. 5, when the rear wheel 11 rides on the convex surface of the road surface, a moment around the shaft 12 in the direction of the arrow A acts on the rear wheel 11, which causes the chain stay 8, the back hawk 10, and the swing arm 13. Since the rear frame 7 made up of the like rotates in the direction of the arrow A, and the elastic body 17 is compressed and deformed accordingly to absorb the shock, it is possible to prevent the shock from being directly transmitted to the body. In particular, when a ring-shaped rubber is used as the elastic body 26 as shown in FIG. 6, the elastic body 26 does not deform so much when a small load is applied and has a hollow portion, that is, a small spring constant is sufficient. On the contrary, when a large load is applied, as shown in Fig. 7, the hollow part disappears and the rubber overlaps, and the spring constant rises further. Further, the rubber itself absorbs the vibration energy, so that a damping effect can be obtained.

Further, when a torsional moment is applied to the frame, the bicycle to which the present invention is applied receives the moment with the two shafts 12 and 14 of the joint portion of the main frame 1 and the rear frame 7, and further Since the two four-bar linkages located on the left and right sides of the wheel 11 are integrally connected to each other by the single swing arm 13, the rigidity of the frame is not impaired.

Further, as shown in FIG. 2, when the position of the elastic body 17 attached to the swing arm 13 is positioned forward as shown by the chain double-dashed line diagram, the apparent spring constant becomes small and, conversely, backward. When positioned, the apparent spring constant is high. Therefore, the strength of the spring can be adjusted by changing the mounting position of the elastic body 17.

[0022]

[Effect of the invention]

 According to the present invention, the rear frame 7 including the chain stay 8, the back hawk 10, and the swing arm 13 is connected to the main frame 1 by the two shafts 12 and 14 and located on the left and right sides of the rear wheel 11 as described above. Since the two four-bar linkages are integrally connected to each other by the single swing arm 13, the shock due to the unevenness of the road surface can be absorbed without impairing the lateral rigidity of the frame. Therefore, according to the present invention, there is no loss of pedaling force due to bending or twisting of the frame, which is safe, and the weight of the vehicle body does not increase excessively.

If the swing arm 13 is provided with a long hole 24 or a plurality of holes 25 so that the fixing position of the elastic body 17 can be adjusted, the apparent spring constant of the elastic body 17 can be reduced. According to the present invention, since the adjustment can be performed, it is possible to easily provide the frame shock absorber suitable for the rider's weight and posture and the condition of the road surface on which the rider rides.

Further, when the ring-shaped elastic body 26 made of, for example, hard urethane rubber is used as the elastic body, at the time of a light load, that is, a slight vibration, the shock is absorbed while the elastic body is not largely deformed. On the other hand, when a large load is applied, the elastic body is greatly deformed and the hollow part is pressed, so the rubber parts overlap and as a result, the spring constant rises and the shock is sufficiently absorbed. Can be done. That is, when this structure of the present invention is adopted, there is an effect that a wide range of loads from large loads to small loads can be accommodated.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a partial detailed view of FIG.

FIG. 3 is a plan view of a swing arm.

FIG. 4 is a plan view showing another structure of the swing arm.

FIG. 5 is a side view showing a state where the rear wheel rides on an obstacle in the frame shock absorber of the present invention.

FIG. 6 is a side view showing another embodiment of the present invention.

7 is a side view showing a state in which a heavy load is applied to the device of FIG.

[Explanation of symbols]

 1 Main Frame 2 Head Pipe 3 Upper Pipe 4 Lower Pipe 5 Standing Pipe 6 Hanger Part 7 Rear Frame 8 Chain Stay 9 Claw 10 Back Hawk 11 Rear Wheel 12 Axis 13 Swing Arm 14, 15, 16 Axis (Horizontal Axis) 17 Elastic Body 18 Coupling 19 Shaft 20 Coupling 21 Bolt 22 Nut 23 Shaft 24 Long hole 25 Hole 26 Ring-shaped elastic body 27, 28 Mounting band 29 Fixing bolt

Claims (3)

[Utility model registration claims] 1. Main frame (1) for a bicycle frame
The chain stay (8) is rotatably connected near the hanger part (6) of the vehicle, and one swing arm (13) is provided above the chain stay. Support shaft (14) extending in a direction perpendicular to the frame surface of
While being rotatably connected to the main frame via
The rear end of the swing arm is rotatably connected to the upper end of the back hawk (10) through another supporting shaft (15) parallel to the supporting shaft, and the lower end of the back hawk is connected to the rear of the chain stay. Two quadruple link mechanisms, which are rotatably connected to the end claws, are integrally connected to each other by the swing arms on both sides of the rear wheel (11). A shock absorber for a bicycle frame, characterized in that an elastic body (17, 26) is interposed between the arm and the arm. 2. The swing arm (13) is provided with an elongated hole (24) or a plurality of holes (25) so that the fixing position of the elastic body (17, 26) can be adjusted. The shock absorber for a bicycle frame according to claim 1. 3. The swing arm (13) and the main frame (1) of the ring-shaped elastic body (26) with the axis of the center hole (26a) orthogonal to the frame surface of the bicycle. The shock absorber for a bicycle frame according to claim 1, wherein the shock absorber is disposed between the shock absorber and the shock absorber.